Object-Oriented JavaScript

Exercises

1. Create an object called shape that has a type property and a getType() method.
2. Define a Triangle() constructor function whose prototype is shape. Objects created with () should have three own properties—a, b, c representing the sides of a triangle.
3. Add a new method to the prototype called getPerimeter().
4. Test your implementation with this code:

   	>>> var t = new Triangle(1, 2, 3);
   	>>> t.constructor

   Triangle(a, b, c)

   	>>> shape.isPrototypeOf(t)

   true

   	>>> t.getPerimeter()

   6

   	>>> t.getType()

   "triangle"

5. Loop over t showing only own properties and methods (none of the prototype's).
6. Make this code work:

   	>>> [1,2,3,4,5,6,7,8,9].shuffle()

   [2, 4, 1, 8, 9, 6, 5, 3, 7]